地表温度反演算法LST Retrieval algorithms
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3) Oபைடு நூலகம்tput
Basis
Surface and atmosphere are both thermal infrared radiation source Radiation can pass through the atmosphere many times being absorbed,scattered and emitted.
NVDI
1.Surface Emissivity
• • • • εwater=0.995（when NDVI le 0） εsurface = 0.9625 + 0.0614FV - 0.0461FV2 （when NDVI ge 0.7） εbuilding = 0.9589 + 0.086FV 0.0671FV2 （when NDVI gt 0 and bt lt 0.7）
（b2-3.39-0.6*（1-b1）*5.12）/（0.6*b1） b1:ε(Surface Emissivity)
b2:tatal radiation value
3.LST Retrieval
by the inverse function of Planck formula,we can get : TS = K2/ln(K1/ B(Ts)+ 1)
K1 =666.09W/(m2·sr·μm)，K2 =1282.71K
ENVI Basic Tools->Band Math，type in：
（1282.71）/alog（666.09/b1 +1）-273
b1:The Radiation luminance values of blackbody in the same temperature
b1：NDVI
Surface Emissivity
2.The Radiation luminance values of blackbody in the same temperature
B(Ts ) [L L (1 )L ]/
Ts:real surface temperature
ENVI Basic Tools->Band Math，type in： （b1 le 0）*0.995+（b1 gt 0 and b1 lt 0.7）*(0.9589 + 0.086*b1 - 0.0671*b1^2)+(b1 ge 0.7)*(0.9625 + 0.0614*b1 - 0.0461*b1^2)
LST Retrieval algorithms
Foreword
In many environments models, such as atmospheric and surface energy and water vapor exchange, digital weather forecasting, global ocean currents, climate change, etc., LST is an indispensable parameter.
Then we can get the real surface temperature
4.Browse
1) clear the default color interval.
2) Add the following four intervals:
39℃>， Red 35℃~39℃，Yellow 30℃~35℃ Green <30℃， Blue
we can obtain a regional or global surface temperature distribution only through remote sensing technology.
Foreword(continue)
Recent years, many methods have been used to estimate the surface temperature through the detected thermal infrared band which usually effected by atmosphere
NDVI：Normalized Difference Vegetation Index
Surface Emissivity
It reflects the nature of the radiation properties
Planck formula
B(Ts ) [L L (1 )L ]/
In theNASA official website (http://atmcorr.gsfc.nasa.gov/),enter the time ,latitude and longitude,we can get the parameters we need
ENVI Basic Tools->Band Math，type in：
：atmospheric transmissivity ：Surface Emissivity
• platform：ENVI（The Environment for Visualizing Images） • Data：石家庄2013/07/25 Path124&Row34 （114:26E 38:03N）include 7 bands from地理空间数据云（中国科学院计算机 网络信息中心提供）
Basis
Surface and atmosphere are both thermal infrared radiation source Radiation can pass through the atmosphere many times being absorbed,scattered and emitted.
NVDI
1.Surface Emissivity
• • • • εwater=0.995（when NDVI le 0） εsurface = 0.9625 + 0.0614FV - 0.0461FV2 （when NDVI ge 0.7） εbuilding = 0.9589 + 0.086FV 0.0671FV2 （when NDVI gt 0 and bt lt 0.7）
（b2-3.39-0.6*（1-b1）*5.12）/（0.6*b1） b1:ε(Surface Emissivity)
b2:tatal radiation value
3.LST Retrieval
by the inverse function of Planck formula,we can get : TS = K2/ln(K1/ B(Ts)+ 1)
K1 =666.09W/(m2·sr·μm)，K2 =1282.71K
ENVI Basic Tools->Band Math，type in：
（1282.71）/alog（666.09/b1 +1）-273
b1:The Radiation luminance values of blackbody in the same temperature
b1：NDVI
Surface Emissivity
2.The Radiation luminance values of blackbody in the same temperature
B(Ts ) [L L (1 )L ]/
Ts:real surface temperature
ENVI Basic Tools->Band Math，type in： （b1 le 0）*0.995+（b1 gt 0 and b1 lt 0.7）*(0.9589 + 0.086*b1 - 0.0671*b1^2)+(b1 ge 0.7)*(0.9625 + 0.0614*b1 - 0.0461*b1^2)
LST Retrieval algorithms
Foreword
In many environments models, such as atmospheric and surface energy and water vapor exchange, digital weather forecasting, global ocean currents, climate change, etc., LST is an indispensable parameter.
Then we can get the real surface temperature
4.Browse
1) clear the default color interval.
2) Add the following four intervals:
39℃>， Red 35℃~39℃，Yellow 30℃~35℃ Green <30℃， Blue
we can obtain a regional or global surface temperature distribution only through remote sensing technology.
Foreword(continue)
Recent years, many methods have been used to estimate the surface temperature through the detected thermal infrared band which usually effected by atmosphere
NDVI：Normalized Difference Vegetation Index
Surface Emissivity
It reflects the nature of the radiation properties
Planck formula
B(Ts ) [L L (1 )L ]/
In theNASA official website (http://atmcorr.gsfc.nasa.gov/),enter the time ,latitude and longitude,we can get the parameters we need
ENVI Basic Tools->Band Math，type in：
：atmospheric transmissivity ：Surface Emissivity
• platform：ENVI（The Environment for Visualizing Images） • Data：石家庄2013/07/25 Path124&Row34 （114:26E 38:03N）include 7 bands from地理空间数据云（中国科学院计算机 网络信息中心提供）